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Reinforcement of Styrene-Butadiene Rubber with Silica Modified by Silane Coupling Agents: Experimental and Theoretical Chemistry Study 被引量:14
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作者 任慧 屈一新 赵素合 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2006年第1期93-98,共6页
The properties of styrene-butadiene rubber (SBR) reinforced by modified silica was investigated according to national standards. Silica was modified by silane coupling agents KH-570, KH-590, and KH-792. The optimized ... The properties of styrene-butadiene rubber (SBR) reinforced by modified silica was investigated according to national standards. Silica was modified by silane coupling agents KH-570, KH-590, and KH-792. The optimized geome-tries of molecular modified silica reinforced SBR were obtained by using B3LYP calculation of density functional theory with the 6-31+G basis sets. The natural bond orbital analyses were carried out. The Si—O bond length of silica modified by KH-792 was the shortest and the electronegative of O was the highest. It indicated that the connection between silica and KH-792 was the tightest. Higher tensile strength and elongation of reinforced SBR was obtained by silica modified with the KH-792. It was caused by large delocalization of lone pair electrons of the two N atoms in KH-792. The S—C bond length in silica modified by KH-590 was longer than the ordinary S—C bond length. Then the sulfur free radical (·S·) was produced more easily in vulcanization. The degree of crosslink was increased by the cross-linkage of the rubber molecule and the sulfur free radical. That was why the highest stress and tear strength of reinforced SBR was produced when silane coupling agent KH-590 was used. The calculation results was in accord with experimental data. 展开更多
关键词 silane coupling agent SILICA styrene-butadiene rubber
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Pyrolysis of vulcanized styrene-butadiene rubber via ReaxFF molecular dynamics simulation 被引量:1
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作者 Yinbin Wang Senjun Yao +6 位作者 Wei Wang Chenglong Qiu Jing Zhang Shengwei Deng Hong Dong Chuan Wu Jianguo Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第3期94-102,共9页
Styrene-butadiene rubber(SBR)is widely used in tires in the automotive segment and vulcanization using sulfur is a common process to enhance its mechanical properties.However,the addition of sulfur as the cross-linkin... Styrene-butadiene rubber(SBR)is widely used in tires in the automotive segment and vulcanization using sulfur is a common process to enhance its mechanical properties.However,the addition of sulfur as the cross-linking agent usually results in impurities in pyrolysis products during rubber recycling,and thus the desulfurization during tire pyrolysis attracts much attention.In this work,the pyrolysis of vulcanized SBR is studied in detail with the help of Reax FF molecular dynamics simulation.A series of crosslinked SBR models were built with different sulfur contents and densities.The following Reax FF MD simulations were performed to show products distributions at different pyrolysis conditions.The simulation results show that sulfur products distribution is mainly controlled by sulfur contents and temperatures.The reaction mechanism is proposed based on the analysis of sulfur products conversion pathway,where most sulfur atoms are bonded with hydrocarbon radicals and the rest transfer to H_(2)S.High sulfur contents tend to the formation of elemental sulfur intermediate,and temperature increase facilitates the release of H_(2)S. 展开更多
关键词 PYROLYSIS REAXFF Molecular simulation Vulcanized styrene-butadiene rubber Sulfur products
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MORPHOLOGY,INTERFACIAL INTERACTION AND PROPERTIES OF STYRENE-BUTADIENE RUBBER/MODIFIED HALLOYSITE NANOTUBE NANOCOMPOSITES 被引量:1
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作者 贾德民 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2009年第6期857-864,共8页
A natural nanotubular material,halloysite nanotubes(HNTs),was introduced to prepare styrene-butadiene rubber/modified halloysite nanotube(SBR/m-HNT) nanocomposites.Complex of resorcinol and hexamethylenetetramine (RH)... A natural nanotubular material,halloysite nanotubes(HNTs),was introduced to prepare styrene-butadiene rubber/modified halloysite nanotube(SBR/m-HNT) nanocomposites.Complex of resorcinol and hexamethylenetetramine (RH) was used as the interfacial modifier.The structure,morphology and mechanical properties of SBR/m-HNT nanocomposites,especially the interfacial interactions,were investigated.SEM and TEM observations showed that RH can not only facilitate the dispersion and orientation of HNTs in SBR matrix at ... 展开更多
关键词 styrene-butadiene rubber Halloysite nanotubes Complex of resorcinol and hexamethylenetetramine NANOCOMPOSITES Hydrogen bond
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Synthesis And Properties Of Functional Ultra-High Molecular Weight Transparent Styrene-Butadiene Block Copolymer
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作者 GONG Guang-bi1, ZHAO Xu-tao1, WANG Gui-lun2 1.Petrochemical Research Institute of Lanzhou Petrochemical Corporation, PetroChina, Lanzhou 730060, China 2.Chemical & Marketing Company of PetroChina Company Limited, Beijing 100011, China 《合成化学》 CAS CSCD 2004年第z1期57-57,共1页
关键词 ANIONIC polymerization styrene-butadiene block copolymer Coupling agent MATHEMATICAL model FUNCTIONAL group
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Strengthening and toughening styrene-butadiene rubber by mechanically interlocked cross-links 被引量:1
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作者 Yuanhao Wang Li Yang +7 位作者 Lin Cheng Jun Zhao Ruixue Bai Wenbin Wang Shaolei Qu Zhaoming Zhang Wei Yu Xuzhou Yan 《Science China Chemistry》 SCIE EI CAS CSCD 2024年第10期3414-3422,共9页
Styrene-butadiene rubber(SBR)is an indispensable material in modern society,and the necessity for enhanced mechanical properties in SBR persists,particularly to withstand the rigors of challenging environmental condit... Styrene-butadiene rubber(SBR)is an indispensable material in modern society,and the necessity for enhanced mechanical properties in SBR persists,particularly to withstand the rigors of challenging environmental conditions.To surmount the limitations of conventional cross-linking modes,mechanical bonds stabilized by host-guest recognition are incorporated as the cross-linking points of SBR to form mechanically interlocked networks(MINs).Compared with covalently cross-linked network,the representative MIN exhibits superior mechanical performance in terms of elongation(1392%)and breaking strength(4.6 MPa),whose toughness has surged by 17 times.Dissociation of host-guest recognition and subsequent sliding motion provide an effective energy dissipation mechanism,and the release of hidden length is also beneficial to enhance toughness.Furthermore,the introduction of the rotaxane cross-links made the network more pliable and possess damping and elastic properties,which can return to initial state with one minute rest interval.We aspire that this direct introduction method can serve as a blueprint,offering valuable insights for the enhancement of mechanical properties in conventional commercial polymer materials. 展开更多
关键词 mechanically interlocked molecules host-guest chemistry styrene-butadiene rubber mechanical properties dynamic materials
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Improving Thermal-oxidative Aging Resistance of Styrene-butadiene Rubber by Antioxidant Loaded Silica Aerogel
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作者 Xue-Fei Ping Yu Wang +5 位作者 Lu Liu Fu-Yong Liu Hong-Wei He Pi Wang Wen-Wen Yu Qiang Zheng 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第8期1198-1209,共12页
The antioxidant N-isopropyl-N'-phenyl-p-phenylenediamine(4010NA)was dissolved in ethanol and impregnated into silica aerogel(SAG)via vacuum-pressure cycles,yielding composite particles(A-N)with enhanced sustained-... The antioxidant N-isopropyl-N'-phenyl-p-phenylenediamine(4010NA)was dissolved in ethanol and impregnated into silica aerogel(SAG)via vacuum-pressure cycles,yielding composite particles(A-N)with enhanced sustained-release and reinforcing capabilities.The effect of A-N on the mechanical properties and thermal-oxidative aging resistance of styrene-butadiene rubber(SBR)vulcanizates was investigated.TGA and BET assessments indicated that the loading efficiency of 4010NA in SAG reached 14.26%within ethanol's solu bility limit.Incorporating A-N into SBR vulcanizates significantly elevated tensile strength by 17.5%and elongation at break by 41.9%over those with fumed silica and free4010NA.Furthermore,A-N notably enhanced the thermal-oxidative aging resistance of SBR.After aging for 96 h at 100℃,the tensile strength and elongation at break of SBR with A-N sustained 70.09%and 58.61%of their initial values,respectively,with the retention rate of elongation at break being 62.8%higher than that of SBR with fumed silica and free antioxidant.The study revealed that A-N composite particles significantly inhibited the crosslinking in SBR's molecular chains,reducing hardening and embrittlement during later thermal-oxidative aging stages. 展开更多
关键词 styrene-butadiene rubber Silica aerogel Loading modification Thermal-oxidative aging
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Insights into the Payne Effect of Carbon Black Filled Styrene-butadiene Rubber Compounds 被引量:6
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作者 An Zhao Xuan-Yu Shi +4 位作者 Shi-Hao Sun Hai-Mo Zhang Min Zuo Yi-Hu Song Qiang Zheng 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2021年第1期81-90,I0007,共11页
As a widely used reinforcing filler of rubber, carbon black(CB) often enhances the nonlinear Payne effect and its mechanism still remains controversial. We adopt simultaneous measurement of rheological and electrical ... As a widely used reinforcing filler of rubber, carbon black(CB) often enhances the nonlinear Payne effect and its mechanism still remains controversial. We adopt simultaneous measurement of rheological and electrical behaviors for styrene-butadiene rubber(SBR)/CB compounds and CB gel(CBG) during large deformation/recovery to investigate the contribution of conductive CB network evolution to the Payne effect of the compounds. In the highly filled compounds, the frequency dependence of their strain softening behavior is much more remarkable than that of their CB network breakdown during loading, while during unloading the unrecoverable filler network hardly affects the complete recovery of modulus, both revealing that their Payne effect should be dominated by the disentanglement of SBR matrix. Furthermore,the bound rubber adjacent to CB particles can accelerate the reconstruction of continuous CB network and improve the reversibility of Payne effect. This may provide new insights into the effect of filler network, bound rubber, and free rubber on the Payne effect of CB filled SBR compounds. 展开更多
关键词 Payne effect styrene-butadiene rubber Filler network
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New Fabrication and Mechanical Properties of Styrene-Butadiene Rubber/Carbon Nanotubes Nanocomposite 被引量:4
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作者 Xiangwen Zhou Yuefeng Zhu +1 位作者 Ji Liang Suyuan Yu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2010年第12期1127-1132,共6页
A novel technology to prepare styrene-butadiene rubber (SBR)/carbon nanotubes (CNTs) composites was developed by combining a spray drying method and a subsequent mechanical mixing process. The cross-linking degree... A novel technology to prepare styrene-butadiene rubber (SBR)/carbon nanotubes (CNTs) composites was developed by combining a spray drying method and a subsequent mechanical mixing process. The cross-linking degrees of the vulcanized composites increased gradually with the additive CNTs contents. By comparing with those of the pure SBR composites, the mechanical properties such as tensile strength, tear strength and hardness of the composites filled with CNTs at certain contents were dramatically improved almost by 600%, 250% and 70%, respectively. The fabrication of the CNTs filled with SBR composites by combination of the spray drying method and subsequent mechanical mixing process was effective for enhancing the reinforcement effects of CNTs in rubbers. The novel technology can also open a new route for the modification and reinforcement on the nanocomposites with large amount of CNTs. 展开更多
关键词 Carbon nanotubes styrene-butadiene rubber Spray drying Mechanical mixing NANOCOMPOSITE Mechanical property
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Synthesis and performance of miktoarm star copolymers of styrene and butadiene
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作者 张海燕 可勇 +2 位作者 姚明 赵素合 张兴英 《Journal of Beijing Institute of Technology》 EI CAS 2011年第2期280-284,共5页
A novel multifunctional macromolecular organolithium initiator (PD-Sn-(RLi)3) was prepared via living anionic polymerization and used for the synthesis of miktoarm star copolymers in cyclohexane. The average molec... A novel multifunctional macromolecular organolithium initiator (PD-Sn-(RLi)3) was prepared via living anionic polymerization and used for the synthesis of miktoarm star copolymers in cyclohexane. The average molecular weight, polydispersity index, microstructure and unit composition of the miktoarm star copolymers were characterized with GPC and 1H-NMR. Performances of the miktoarm star styrene-butadiene rubbers were investigated in comparison with those of the blend rubbers such as the tin-coupled star-shaped random copolymers of styrene-butadiene rubber(S-SBR)/natural rubber (NR) blend rubber and S-SBR/Cis-1, 4-polybutadiene rubber (Cis-BR) blend rubber. 展开更多
关键词 anionic polymerization multifunctional macromolecular organolithium initiator miktoarm star copolymer styrene-butadiene rubber
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STUDY ON THE SEQUENCE STRUCTURE OF SBR BY ^(13)C-NMR METHOD Ⅵ MONTE CARLO SIMULATION OF THE SEQUENCE OF SBR
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作者 余鼎声 吴明光 焦书科 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1993年第2期158-162,共5页
A program of Monte Carlo simulation of binary copolymerization for E-SBR (emulsion polymn. SB rubber) was made according to the terminal model. The simulation results obtained by this program were in good agreement wi... A program of Monte Carlo simulation of binary copolymerization for E-SBR (emulsion polymn. SB rubber) was made according to the terminal model. The simulation results obtained by this program were in good agreement with those experimental ones. A detail microstructure information of E-SBR molecular chain has been provided. 展开更多
关键词 Monte Carlo simulation styrene-butadiene copolymerization Molecular chain microstructure and sequence distribution
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Performance development of styrene-butadiene copolymer-modified calcium sulfoaluminate cement mortar under different curing conditions
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作者 Ru WANG Yu-sheng FAN +2 位作者 Zhao-jia WANG Tian-yong HUANG Tao ZHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2021年第12期1005-1026,共22页
The purpose of this study was to investigate the change in the physical and mechanical properties of styrene-butadiene copolymer(SB)dispersion-modified calcium sulfoaluminate(CSA)cement mortar as it aged from 28 to 36... The purpose of this study was to investigate the change in the physical and mechanical properties of styrene-butadiene copolymer(SB)dispersion-modified calcium sulfoaluminate(CSA)cement mortar as it aged from 28 to 360 d,and cured at different temperatures and relative humidities.The results show that the mechanical properties of reference mortar(RM)of CSA cement,including its flexural,compressive,and tensile bond strength,showed a reduction after a certain time,but its water capillary absorption was hardly affected by age.When SB dispersion was added,there was no reduction in mechanical strength.The amount of SB added did matter.Addition of 5% SB had a negative effect on most properties compared with RM,except for tensile bond strength.However,the properties of SB-modified mortar(SBMM)were enhanced significantly as the amount of SB was increased from 5% to 20%.Temperature change had different effects on the properties of RM and SBMM.High temperature was beneficial to early flexural and compressive strength development of RM,but caused serious strength reduction at later stages.High temperature enhanced the development of tensile bond strength of RM.Increasing temperature enhanced properties of SBMM,including flexural,compressive,and tensile bond strength.Higher relative humidity improved all measured properties of all mortars.Scanning electron microscope(SEM)observations of the morphology of RM and SBMM at 360 d cured under different conditions accounted well for the changes in mechanical properties. 展开更多
关键词 Calcium sulfoaluminate(CSA)cement styrene-butadiene copolymer(SB)dispersion MORTAR Properties Curing temperature Relative humidity(RH)
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A rheological method for selecting nano-kaolin powder as filler in SBR rubber 被引量:4
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作者 Alberto Lagazzo Sergio Lenzi +3 位作者 Rodolfo Botter Paolo Cirillo Fabrizio Demicheli Dario T. Beruto 《Particuology》 SCIE EI CAS CSCD 2010年第3期245-250,共6页
This paper shows that the stiffness ofstyrene-butadiene solid rubber with added kaolin powder is related to the yield stress of kaolin dispersion in liquid polybutadiene rubber up to the percolation threshold. For fiv... This paper shows that the stiffness ofstyrene-butadiene solid rubber with added kaolin powder is related to the yield stress of kaolin dispersion in liquid polybutadiene rubber up to the percolation threshold. For five kinds of kaolin powder, the value of τ° spans the range of 100-430 Pa, while the corresponding compressive elastic constant of SBR varies from 12 to 21 MPa. A relationship between τ° and △E^i^*/ER^* is proposed. Critical examination of these data infers that kaolin powder dispersed in solid rubber matrix acts as an additive which decreases the random movement of the polybutadiene chains. Consequently, dispersions of nano-particles in liquid and in solid SBR are considered to be related, thus leading to a theological method for selecting nano-particles as fillers in solid SBR. 展开更多
关键词 Yield stress Kaolin Filler dispersion Stiffness styrene-butadiene rubber (SBR)Liquid polybutadieneRheology
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